They compiled a similar list for 2011, and updated it here.
That update ends as follows:
11. Cold or Fake OffersQ. It is reported that some employers give offers to summer associates with the understanding that the offer will not be accepted. What is NALP’s view of this practice?A. NALP does not condone this unethical practice. Whether initiated by students to appear more attractive to future employers or by employers to enhance their offer ratios, the practice is fraudulent and unprofessional. NALP suggests that employers adopt a standard policy of extending or confirming offers in writing, signed by a representative of the organization, so that only legitimate offers are made.